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Related Concept Videos

IR Spectrometers01:25

IR Spectrometers

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There are two main infrared (IR) spectrophotometers: dispersive IR spectrometers and Fourier transform infrared (FTIR) spectrometers. In a dispersive IR spectrometer, a beam of infrared radiation produced by a hot wire is divided into two parallel equal-intensity beams using mirrors. One beam passes through the sample, while another is a reference beam. The beams then move through the monochromator, which separates the radiations into a continuous spectrum of different frequencies. The...
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Infrared (IR) Spectroscopy: Overview01:09

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When electromagnetic radiation passes through a material, atoms or molecules transition from a lower to a higher energy state by absorbing radiation corresponding to the energy difference between the two states. The absorption of infrared (IR) radiation causes transitions between vibrational energy levels in a molecule. Therefore, IR spectroscopy is a useful analytical tool for determining the molecular structure of molecules.
Different compounds display unique properties due to their...
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Attenuated Total Reflectance (ATR) Infrared Spectroscopy: Overview01:13

Attenuated Total Reflectance (ATR) Infrared Spectroscopy: Overview

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Attenuated total reflectance (ATR) infrared spectroscopy is a powerful analytical technique used to study the composition of materials. It is widely employed in chemistry, materials science, forensic science, and other fields where sample characterization is required. ATR has several advantages over traditional transmission IR spectroscopy, including the requirement of little to no sample preparation and the ability to analyze a wide range of samples.
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Total Internal Reflection Fluorescence Microscopy01:05

Total Internal Reflection Fluorescence Microscopy

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Total internal reflection fluorescence microscopy or TIRF is an advanced microscopic technique used to visualize fluorophores in samples close to a solid surface with a higher refractive index, such as a glass coverslip. TIRF only allows fluorophores in proximity to the solid surface to be excited. When light from a medium with a lower refractive index (such as air) hits the glass coverslip at a critical angle, the light undergoes total internal reflection stead of passing through the glass.
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IR Frequency Region: Fingerprint Region01:03

IR Frequency Region: Fingerprint Region

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IR spectra are divided into two main regions: the diagnostic region and the fingerprint region. The diagnostic region of the spectrum lies above 1500 cm−1. The absorptions resulting from single-bond vibrations of the N–H, C–H, and O–H stretch at higher wavenumbers and appear on the left side of the spectrum. The stretching absorptions of the C≡C and C≡N occur between 2100–2300 cm−1. In contrast, those arising from stretching absorptions of the...
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IR Spectrum01:19

IR Spectrum

1.7K
When infrared (IR) radiation passes through a molecule, the bonds stretch or bend by absorbing the radiation. This absorption creates the molecule's absorption spectrum, which is the plot of its percentage transmittance versus wavenumber.
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Thermal Camera-Based Fourier Transform Infrared Thermospectroscopic Imager.

Stéphane Chevalier1, Jean-Noël Tourvieille2, Alain Sommier1

  • 1I2M UMR 5295, Arts et Metiers Institute of Technology, CNRS, Université de Bordeaux, INRA, INP, HESAM Université, Talence, France.

Applied Spectroscopy
|October 29, 2020
PubMed
Summary

We developed an advanced thermospectroscopic imager combining Fourier transform infrared (FT-IR) spectroscopy and thermal imaging. This instrument rapidly captures thermal and absorbance data, revealing complex chemical and thermal processes.

Keywords:
FT-IRFourier transform infraredIRcalibrationimaginginfraredparaffinspectroscopy

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Area of Science:

  • Spectroscopy
  • Thermal Imaging
  • Chemical Analysis

Background:

  • Traditional methods lack speed and resolution for transient phenomena.
  • Advanced imaging is needed to study dynamic thermochemical processes.

Purpose of the Study:

  • To present a novel thermospectroscopic imager.
  • To demonstrate its capability in analyzing fast transient thermal and chemical phenomena.

Main Methods:

  • Integration of a commercial FT-IR spectrometer with an IR camera.
  • Synchronization and synchronized data acquisition for spatial and spectral information.
  • Image processing using fast Fourier transform for absorbance spectra generation.

Main Results:

  • The imager achieves high spectral resolution (<4 cm-1) and rapid data acquisition (>1750 spectra/sec).
  • Validated using polystyrene films, it accurately captures thermal and absorbance fields.
  • Demonstrated transient analysis during paraffin phase change and polymer solidification.

Conclusions:

  • The FT-IR thermospectroscopic imager is a powerful tool for studying fast transient thermal and chemical processes.
  • Offers improved spectral resolution for detailed analysis of dynamic events.
  • Enables comprehensive understanding of thermochemical mechanisms in materials.